tests: use `printf' instead of `echo'

* t/ax/tap-functions (diag_): Use `printf' instead of `echo' in case
`echo' processes backslash escapes or the argument looks like an
option.

diff --git a/t/ax/tap-functions.sh b/t/ax/tap-functions.sh
index 29b9a028c826e3c69ff2b32d8f51a491eb737e09..a458b773e8f1230a545fc75ae82493a8b57524e6 100644 (file)
--- a/t/ax/tap-functions.sh
+++ b/t/ax/tap-functions.sh
@@ -77,7 +77,7 @@ diag_ ()
 (
   set +x
   test $# -eq 0 || while IFS= read -r line; do
-    echo "$diag_string_ $line"
+    printf %s\\n "$diag_string_ $line"
   done <<EOF
 $*
 EOF